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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f3869a038d30a76f22b5b59db19fd26039eb649b03ba984d2603f46d6309421' 
  AND token = 'FgytpiSNF+YB9MVB6w+jRtbDEbrtawG/oho681k9q/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}